Explained: Speed of Sound

This video goes through a derivation of the speed of sound for a general gas, and then specifies it to the more well-known ideal gas case.
===== RELEVANT VIDEOS =====
Conservation of Mass (4 methods):
goo.gl/4f0gnA
goo.gl/SdaE6K
goo.gl/a24ECN
goo.gl/rQmYKX
1D Conservation of Mass:
goo.gl/0zkaZx
Conservation of Momentum:
goo.gl/LN5zUk
1D Conservation of Momentum:
goo.gl/wSdAhF
===== REFERENCES =====
:: Notes by Matt MacLean
:: Modern Compressible Flow, Anderson
:: Elements of Gasdynamics, Liepmann and Roshko
:: Gas Dynamics, Zucrow and Hoffman